Two field experiments were conducted at Wadi El-Natrun, Beheira governorate, Egypt in 2020 and 2021 summer seasons on sweet pepper plants hyprid 1515. The study aims to investigate the effect of glycine betaine, chitosan and salicylic acid as foliar spray at concentrations of 2, 3 and 1 g/l, respectively to ameliorate the adverse effects of salt stress. The results demonstrated that all applied treatments greatly improved all growth parameters, including plant height, leaf area, fresh and dry weight, and mineral composition (nitrogen, phosphorus and potassium) and significantly reduced the impacts of salinity stress. Additionally, foliar spraying with glycine betaine, chitosan, and salicylic acid in this study increased total yield and average fruit weight compared to the control. Glycine betaine therapy outperformed all other treatments in terms of its favourable impact on plant growth, mineral content, average fruit weight, and overall yield. Chitosan treatment came in second. The salicylic acid therapy was shown to have the least beneficial effect. Contrarily, the control group of sweet pepper plants, which received no treatment, had the lowest values of the previous features.